In the present paper, the fatigue behaviour of a near-equiatomic pseudo-elastic NiTi SMA (Shape Memory Alloy) is experimentally examined by means of tensile cyclic loading tests. In situ X-ray Diffraction (XRD) analyses are also performed in order to measure the contents of both austenite and martensite phase during testing. The experimental campaign highlights a stress–strain diagram defined through five different stress–strain functions. Such a diagram is here proposed to be analytically described by a model in two steps: (i) firstly, the domain for each of the above functions is determined by exploiting the experimental measurements of both austenite and martensite phase content; (ii) then, the equations defining each function are deduced by assuming that the fatigued material behaves as a single-spring system or a two-spring system (working in parallel or in series).

Fatigue analysis of a near-equiatomic pseudo-elastic NiTi SMA / Vantadori, Sabrina; Carpinteri, Andrea; Di Cocco, Vittorio; Iacoviello, Francesco; Natali, Stefano. - In: THEORETICAL AND APPLIED FRACTURE MECHANICS. - ISSN 0167-8442. - 94:(2018), pp. 110-119. [10.1016/j.tafmec.2018.01.012]

Fatigue analysis of a near-equiatomic pseudo-elastic NiTi SMA

Natali, Stefano
2018

Abstract

In the present paper, the fatigue behaviour of a near-equiatomic pseudo-elastic NiTi SMA (Shape Memory Alloy) is experimentally examined by means of tensile cyclic loading tests. In situ X-ray Diffraction (XRD) analyses are also performed in order to measure the contents of both austenite and martensite phase during testing. The experimental campaign highlights a stress–strain diagram defined through five different stress–strain functions. Such a diagram is here proposed to be analytically described by a model in two steps: (i) firstly, the domain for each of the above functions is determined by exploiting the experimental measurements of both austenite and martensite phase content; (ii) then, the equations defining each function are deduced by assuming that the fatigued material behaves as a single-spring system or a two-spring system (working in parallel or in series).
2018
fatigue behaviour; phase transition; Shape Memory Alloy (SMA); tensile cyclic loading test; X-ray diffraction analyses; materials science (all); condensed matter physics; mechanical engineering; applied mathematics
01 Pubblicazione su rivista::01a Articolo in rivista
Fatigue analysis of a near-equiatomic pseudo-elastic NiTi SMA / Vantadori, Sabrina; Carpinteri, Andrea; Di Cocco, Vittorio; Iacoviello, Francesco; Natali, Stefano. - In: THEORETICAL AND APPLIED FRACTURE MECHANICS. - ISSN 0167-8442. - 94:(2018), pp. 110-119. [10.1016/j.tafmec.2018.01.012]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1256721
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